Cramps

It seems since about the early afternoon hours I have had mild cramping consistently. Like it doesn't stop, it's just one long crampy feeling. This is my 3rd and I'm 29 weeks and 4 days, so I know it isn't a contraction feeling. Probably just the baby's position and movements. It doesn't hurt really except in my back I have slight pain. I know I need to get adjusted and do more pelvic exercises, but was curious if anyone else has had similar cramping.